i just beat the stuff about a month ago and i learned quite a bit. if you have rapidly reproducing algae, your water is not fine. chances are, the algae is using the phosphates and nitrates up as they are produced so your tests will read zero, leading to the "perfect water." you can buy all the bio-fixes you want, but until you find the source you will always be fighting an uphill battle. phosphates can get into your system through anything from tap water to the foods you're using. find a good RO/DI source and switch out your filter media. i ran a 50/50 of carbon and GFO. also, old lights can be a culprit as well. it sucks to spend a fortune on new bulbs, but it can save a headache. after your sources are in check grab a solid CUC, my asterea's and crabs weren't touching the stuff so i bought two mexican turbo snails for a 50 gallon with 80+ lbs of live rock and the stuff was gone in under a week. some people have had luck with the manual removal of pulling and pinching it out, but i opted out of that because 1) i feel that this just spreads the spores/seeds around and facilitates more growth and 2) i'm just too lazy to spend my afternoon pinching seaweed. any algae is an eye sore. good luck and try not to stress too much, bro. this is a hobby that just takes time before you get it right. luckily you're in the right place, these guys know their stuff!